Studying for math test

Multiply; then use fundamental identities to simplify the expression below and determine which of the following is not equivalent.
(sin x + cos x) ^2

a. 1+2sinxcosx
b. sec^2x−tan^2x+2cosxsinx
c. sec x + 2 sin x/sec x
d. sin^2x+cos^2x
e. 1+2cos (pi/2 -x) cosx

asked by Lottie
  1. take a look at the related questions below. In particular,

    http://www.jiskha.com/display.cgi?id=1468255540

    posted by Steve
  2. ah ok, so would it be answer a?

    posted by Lottie
  3. Read the question carefully. It said

    which of the following is not equivalent?

    Actually, both c & d are not

    posted by Steve

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